General Information:
Chemical Formula:
Zn2(AsO4)(OH)
Composition:
(Molecular Weight = 286.71 gm)
Zinc 45.61 % Zn
Arsenic 26.13 % As
Hydrogen 0.35 % H
Oxygen 27.90 % O
Empirical Formula:
Zn2(AsO4)(OH)
Locality:
TL: Chile, Atacama, Cha¤arcillo
Name Origin:
Named after the French mineralogist Gilbert Joseph Adam (1795-1881).
Physical Properties:
Cleavage:
[101] Good, [010] Poor
Color:
yellow, green, violet, pink, or yellowish green.
Density:
4.3 - 4.5, Average = 4.4
Diaphaniety:
Subtransparent
Habits:
Tabular - Form dimensions are thin in one direction., Druse - Crystal growth in a cavity which results in numerous crystal tipped surfaces., Encrustations - Forms crust-like aggregate s on matrix.
Hardness:
3.5 - Copper Penny
Luminescence:
Fluorescent and phosphorescent.
Luster:
Vitreous - Resinous
Streak:
white
More details...